createQuery 与 createNativeQuery 区别

 

iabernate 中createQuery与createSQLQuery区别，使用经验 
createQuery与createSQLQuery两者区别是： 


前者用的hql语句进行查询，后者可以用sql语句查询 

前者以hibernate生成的Bean为对象装入list返回 

后者则是以对象数组进行存储 
 

所以使用createSQLQuery有时候也想以hibernate生成的Bean为对象装入list返回

如下示例：

 

 

1. @Override

2. public List<Commodity> findCommodityByActyId(int activityId) {

3. String sql = "SELECT aa.ACTIVITYSCOPE_VALUE from activity_scope aa LEFT JOIN activity_rule ar ON aa.ACTIVITYRULE_ID = ar.ACTIVITYRULE_ID LEFT JOIN"

4. +" activity ac on ar.ACTIVITY_ID = ac.ACTIVITY_ID where ac.ACTIVITY_ID ="+activityId+" and ac.status=3";

5. System.out.println(sql);

6. Query query = entityManager.createNativeQuery(sql);

7. List<Integer> commoditiyIds = (List<Integer>)(query.getResultList());

8. List<Commodity> commodities = new ArrayList<Commodity>();

9. for(int i=0;i<commoditiyIds.size();i++) {

10. String sql2 = "from Commodity c where c.commodityId=:c1";

11. Query query2 = entityManager.createQuery(sql2);

12. query2.setParameter("c1", commoditiyIds.get(i));

13. Commodity c = (Commodity) query2.getResultList().get(0);

14. commodities.add(c);

15. }

16. return commodities;

17. }